The bridge coordinate measuring machine (CMM) is a highly advanced equipment used extensively in the industrial and manufacturing sectors for quality control purposes. It is considered the gold standard when it comes to precision and accuracy in measurements. One of the key features that make the bridge CMM so reliable is the use of a granite bed as the foundation on which other parts of the machine are integrated.
Granite, being an igneous rock, has excellent stability, rigidity, and dimensional stability. Granite is also resistant to thermal expansion and contraction, which makes it an ideal material to form a stable base for the CMM. Additionally, the use of granite in the machine bed provides a higher level of damping compared to other materials used in the construction of the machine bed, making it better suited to damp vibrations that may affect measurement accuracy.
The granite bed forms the foundation of the bridge CMM and serves as the reference plane from which all measurements are made. The base is constructed according to well-established manufacturing practices using high-grade granite blocks that are carefully selected and machined to meet rigorous specifications. The bed is then stress relieved before being installed in the CMM.
The bridge, which spans over the granite bed, houses the measuring head, which is responsible for performing the actual measurements. The measuring head is designed in a way that allows three linear axes to be driven simultaneously by high-precision servo motors to provide accurate positioning. The bridge is also designed to be rigid, stable, and thermally stable to ensure measurements are consistent and precise.
The integration of the measuring head, bridge, and granite bed is achieved through advanced engineering practices and technologies such as Linear Guides, Precision Ball Screws, and Air Bearings. These technologies enable the high-speed and high-precision movement of the measuring head necessary to capture the measurements accurately, and also ensure that the bridge precisely follows the optical scale to ensure perfect synchronicity.
In conclusion, the use of granite bed as foundational element in the bridge CMM, which is subsequently integrated with other parts of the equipment, is a testament to the level of precision and accuracy that these machines can achieve. The use of granite delivers a stable, rigid, and thermally stable foundation that allows for precision movements and improved accuracy in measurements. The bridge CMM is a versatile machine that is integral to modern manufacturing and engineering practices and will continue to drive advancement in these industries.
Post time: Apr-17-2024